30700021749 has 4 divisors (see below), whose sum is σ = 40933362336. Its totient is φ = 20466681164.

The previous prime is 30700021747. The next prime is 30700021777. The reversal of 30700021749 is 94712000703.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30700021749 - 2¹ = 30700021747 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30700021747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5116670289 + ... + 5116670294.

It is an arithmetic number, because the mean of its divisors is an integer number (10233340584).

Almost surely, 2^30700021749 is an apocalyptic number.

It is an amenable number.

30700021749 is a deficient number, since it is larger than the sum of its proper divisors (10233340587).

30700021749 is a wasteful number, since it uses less digits than its factorization.

30700021749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10233340586.

The product of its (nonzero) digits is 10584, while the sum is 33.

The spelling of 30700021749 in words is "thirty billion, seven hundred million, twenty-one thousand, seven hundred forty-nine".